in his attack plan because a captured u . s . pilot disclosed that the ridge was the weak ##est part of the marine defenses . japanese bombers attacked the ridge during daytime on 11 – 12 september , causing a few casualties , including two killed . the americans knew of the approach of the japanese forces from reports from native scouts and their own patrols , but did not know exactly where or when they would attack . the ridge around which eds ##on deployed his men consisted of three distinct hill ##ocks . at the southern tip and surrounded on three sides by thick jungle was hill 80 ( so named because it rose 80 ft ( 24 m ) above sea level ) .
in his attack plan because a captured u. s. pilot disclosed that the ridge was the weakest part of the marine defenses. japanese bombers attacked the ridge during daytime on 11 – 12 september, causing a few casualties, including two killed. the americans knew of the approach of the japanese forces from reports from native scouts and their own patrols, but did not know exactly where or when they would attack. the ridge around which edson deployed his men consisted of three distinct hillocks. at the southern tip and surrounded on three sides by thick jungle was hill 80 ( so named because it rose 80 ft ( 24 m ) above sea level ).